Note that you can convert
original wallpaper file to the picture with
different dimensions in pixels. If the requested dimensions of the output file is essentially
exceeds the corresponding parameters of the original file, the image will be blurred.

If the file is disproportionately stretched, the image is distorted,
but all parts of the picture are saved.

In case you chose cropping, two image bars will be lost at the
edges of the raster, but there will be no distortion.